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Tell FlyerIntel where and when you are flying. It will show how that route actually performs at that time of day and on that day of the week, what both airports are doing right now, and when to get to the airport.
IAD → SEA
Washington to Seattle · departing 5:55 PM
IAD → SEA flights departing 3–6 PM arrive on time 75.4% of the time, against 79.4% across the whole day — your departure window is 4.0 points worse than average for this route.
There is no day-by-hour view for IAD → SEA: only 14 of its weekday-and-hour slots have 120 or more flights, and a day-by-hour view needs 45.
Other times on IAD → SEA
Time of day
On IAD → SEA, flights leaving 12–3 PM arrived on time 90.6% of the time, against 75.4% for those leaving 3–6 PM: 15.2 points more often.
- 5–9 AM85.3%
- 9 AM–12 PM83.2%
- 12–3 PM90.6%
- 3–6 PM75.4%
- 6–9 PM68.1%
- 9 PM–5 AM69.4%
Day of week
- Monday77.7%
- Tuesday81.1%
- Wednesday81.1%
- Thursday78.2%
- Friday79.5%
- Saturday79.8%
- Sunday78.3%
Bars start below the lowest figure so a real gap is visible; read the percentage, not the bar length. A time with too few flights to score is left unscored rather than guessed at.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · History describes what has happened on this route. It is not a prediction about your flight. Full route profile →
Which flight
Flights on IAD → SEA, the ones scheduled closest to 5:55 PM first.
Source: FlyerIntel analysis of US DOT BTS data · July 2023 – July 2026 · “Usually departs” is the scheduled time each flight number most often had over the period; airlines retime flights, so confirm the time on your booking. Flight numbers with fewer than 90 operations on this route are left out. This is history, not a forecast for your flight.
When to get to the airport
A starting point for IAD, not a promise about your day.
2h 20m before your 5:55 PM departure
How this was worked out
- FlyerIntel cannot currently obtain live security wait times for IAD, so this figure does not account for the queue on the day.
- It does not include your journey to the airport, parking, or a shuttle from a remote lot.
- International departures, and travel with children, checked pets or special assistance, need more time.
Both airports right now
Aviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedAviation weather is not currently a factor.
Minimal operational impact. Conditions are not a notable factor for operations right now.
UpdatedSource: NOAA Aviation Weather Center · Conditions describe the airfield, not your flight, and change quickly.
Who flies this route
Performance by the carrier that actually operates the flight.
| Carrier | Flights | On time | Cancelled | Median delay |
|---|---|---|---|---|
| Alaska Airlines | 2,625 | 77.5% | 0.99% | -6 min |
| United Airlines | 2,421 | 81.8% | 1.40% | -9 min |
| Delta Air Lines | 1,475 | 78.8% | 0.95% | -8 min |